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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a557251040701e6ab421b75ec2601d424884222b1d36bf3e52ba2db3a5513f' 
  AND token = 'BrsYvzEMKRs1MiWEXan0GLho7euBs5ypOtzJz8mAbho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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