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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4920ae2fb3fef170e0b9aa54ec12990fbdf201f59c6580cb20b22dd86bec69' 
  AND token = 'n0rImqYaiHmDKt9ZGvsS64k7kfvS5Emp2VX0fWsG+bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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