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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c53be6b15b296b832106dfb8f19573d2b756342de2bda4060d902183f38bb7e' 
  AND token = 'wQ2HRFDo2Pv+4nVmv6J8ZKZkgJNlSlsycmI11kwNwsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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