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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d321fa7a99b425f6e02a5fcfd5978512e2c2ca34ee2c4c85e56d1c0563f9e2e' 
  AND token = 'gr6VHgStiZEvagVbb2i2rozTIplgmMbJ9Enkxaw8ywo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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