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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7055a2916d3af7cb3c1d80d01b0a1f8af9cd50cf37c15d5d60d54b216e9dbee1' 
  AND token = 'plNGrFy8SQZk9MDo2R3hbeVfJ0ZbyG1wsZgkEpOEf3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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