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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a872770016b59ef8dad79ced6618397c8cc8af6a11e9d38c563d4eff4d00b9' 
  AND token = 'LxurzFft5+ALS3rF4aNlCyyO7l2d69Vq/BVlSYPDdEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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