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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a132683292dc349d1178c327083dabffad7cc8a310aa66d40e4b9d8d49ef2636' 
  AND token = 'FRTPHxeunKj6Ect58spehj0EyrTKUa7QDYV5FMRRPbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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