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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ae81ae56a210aee8612281f3b4c3c09744bedf7f9ec3b74533b4a30ea7966e7' 
  AND token = '7pgYFRtjD6l9SQlhoE2HBWv4lqlzp3oEZcvFGYDAHkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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