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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e80170017b97d7fae1522c708bbdbf37566cc41f3731ac58a62d182c64ebeae0' 
  AND token = '5Os8K9EgVsMimotZIkpl+/Ajoues9mQ1hSLc1Smyf4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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