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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878e5768d0155e9f91b118ff6a74a0e799c089ef41e156900bf1129125b4d560' 
  AND token = 'T2AugztWXNJJWFH8eZnGTbbVP7n3zcmnFg0zoF5GJnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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