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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66841f8f42115121b8c8ff2fd119a061cbbc725d732d16975f5f683df36930b' 
  AND token = 'KF58q3qH2stWbROD02qYZ4lOI2DV+WynTO9Wh7WKGDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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