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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cabbac3c8ae2e38f941af1d2c8ec3873f45ede5e38d9c4b3193a9a7634c4e2a' 
  AND token = 'ujcB7rVA0oRfEG4tyOgcBWwLyLUJzu3zLrEB63Kz1i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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