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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a2663beddcc5b1ed5a09653d9fed56ed0cdd194a39edcfa524059e717fbfb4' 
  AND token = 'JCcKJ/wwgezvoxk68/kni5sP6e3QQn9V3IJ9Z0FX/UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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