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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '276dd9dc1bb1c0868fd41379bb5ec0207d57c700fb66b6feaedad271605da416' 
  AND token = 'EJq84S3GY4ORD6LcvhCt2S4+X5nvsnaGp3lkNsKLmPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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