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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127e47a6fdcff0ef5499dfd2a315952bba00e399f490d78d14125d7a2bb16346' 
  AND token = 'G2+EEOVNl3p6QecL9yn0Xe+12jn2xARz5ikI+0EfGuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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