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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038ac890ce0ad33591e69e32d4ba99ad519a7fdc5c130d6771a1e6b7ccdb1090' 
  AND token = 'FpHNkzc/WJYMiiNGvhN6sgc4BXyzkH29By3gCJBoQac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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