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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7d2e575265e5daea50b14f7327294af34dad682e0f19a817fdbf369a4a169a' 
  AND token = 'hjxO5lmvdDcf6nDY692ASR5EPWjN7bGc2ND6uInVPk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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