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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee3e2837d56bb22884e4628f6940accb8900019115fd311c4590d0f0a23275f' 
  AND token = '+plIpDxtseplDkFrTWfjfrPEYcwts/p5ggpiH9yC/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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