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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7266470a779f6ed8816d679034066e5669617a40b8fa3ee3fba2cb9aa65b163e' 
  AND token = 'hO/eT7bEP5N2NVLe4ejNyqcnvVA9EKxwSNfHKPHCJM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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