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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec2d5b9b49e272b0bc06b2865caf0d61ad2b975ad47574d5eb6f40a70a2847d' 
  AND token = 'AsN8EWhwh8Dr64P/4r8osBuhOwkO1q05F6ZucVPJW5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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