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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3741d7a64ee28a6bdd58c2b22b7ac22ed0f6317147b162c32a42948f3f6b2fa' 
  AND token = 'vVYPxurbsCxYLb5I1U5qCWA5UoFhSgoGDr0aDVra5zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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