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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30c1c87fb28fd4f71743a65f1eef6a3905aa5370828cc5f339062da7c1aa7e3' 
  AND token = 'bq5yvqM1dLDYqWacc7M1UaYDvnKSgoG5ZzA6Gy00YoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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