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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90526374634d9213cc71b0bb2bb1d9881202e6b78656d841d8dab6e10a449d41' 
  AND token = 'Ufqj4cdA1ZlaHFl12QBp+hQ/pGNxPJ442uJ6M81GU8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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