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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1ad4eb99beefd05b212eac9604965b63a9b42af4d367a209b2d23dcdffe252' 
  AND token = 'F0jKDeA1225haPm8HVj79WwoPzOz/XbceWNj3mTeJX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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