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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94945489ec516a020ed624e8411ea7e1e1dcfbec3d487800ce95f4fcc6d3e40' 
  AND token = '8E0lU31nCipUkW++9xNIAKxKLsyVuybonJCG/d/9Ag0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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