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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3bd62289c426875bb6751342994647e27d42ab1136092f4f95c343abb24703e' 
  AND token = 'z6uDbYgP/VdN9wec5f/Hsl0mYuS5NVuGQ0Ds68e68XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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