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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b55decf86822a074a43b394e2963c81e1b9a33d1a62f16b743513d0eef1f4d4' 
  AND token = 'pCQQ8QsdoPS7vRdpRd8iOoPCRWz8s3hhK9oIKdf5oFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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