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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d4e09ca3006af20f094230d152ea68127923c00db76698d152a12e573afd00' 
  AND token = 'FqJdVKfkOyjlHDD4ilQUIOeelFpk9SfXedsh5l4o1+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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