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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e5e049c2f7067ca9bb3310d326234916e7255187a595afad0f0609dc74a3932' 
  AND token = '3dquB5WMz3xlfrv32uhu+3v1t4LnUUl2JQfaG4OHD8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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