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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa62d8236e0864061e9e0b5da5782dead989666f527a9a05a9b08cf9de5757b' 
  AND token = 'vv1o3HQWgfolNBq770vSUmTF4V2FikvVEpmFNml39LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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