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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a7bbecbc7498ce863fc89fcbcc2d42559f2c4b8cb2a4912821d9ef66c3dcb8b' 
  AND token = 'BKKIaAOCFlmdXmfnXuEi6oMk1Kc4xuV2juDG5xPhw44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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