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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29da8725156ea94b4f6746591751a1144c204238f1c269f7ee26f72e1eb11b43' 
  AND token = 'h4SotLrMN4C8IpRJTbtC++Lom75xW3A6tDUx5ndMXkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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