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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3015beee86bb2d17b0e9c65dd52a330592733c32d7ec29929ae8554ba5fd8d73' 
  AND token = '6aZXjOhE+FZjoamsseUPMenSXCq0Iu5a/XT0bu4G+W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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