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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4ad1273af593fb816b116427264c75251aa175eab860045285026d6ff5e751' 
  AND token = '7eCtxJ1EL6mBbF+NrxmtSDwxNPg/s30Bu2/ammar5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}