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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1814100105777cafa071fdba15043c872f95577b7230a6b857a92bbc1834065a' 
  AND token = 'yNz1Pb45x0eAPGDiYD10d+fNxY8iEzQuVcHM1Dn14Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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