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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc616f1a2dad85c97f91c420f83e63941aa34dccf87c290cbeeaf0f99b8879' 
  AND token = 'LaqIcaioEPqSkbX5v3+VGYVuCvCyVIUgXFToRK8Ho1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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