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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0436015cd1c084772d8b02b2bc01ca966fa9aa91fe5f1d90cc029dde0c866160' 
  AND token = 'Z8nL3ioxgVpmHmAXTI54MjIzXL+HpiCLMMo3DAJ6JNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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