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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a095d414086e3abe67526920aeb2dd59f5c9e2913c572b544b9e20eab3e3b24d' 
  AND token = 't4SRRTCmID4eq0uNQNK08obR0ktknxlXBKJ9V0dr2X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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