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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b9618af93bd9277c9688ba9f2d40f0348638fd4fe033919e6e0c401fbe1f99a' 
  AND token = 'qfPc4GJqEAu9CXWYxUBW1byAJEhly2q7WQmbCAkNFmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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