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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e78233da7982d73d1696e6bb0df29c36c4b2704baf6d0f7ad6c16c9175877bd' 
  AND token = 'Xh4XvuROacFDrsrCMfEKYCGzhW2YRYTDx6fD6IkyGfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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