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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191409a3044818fafcbcb7e0b681ef8d4d02eec2d8f09a8b01cc96ed5831e437' 
  AND token = 'oNi0p0oCYpX0migMeQ983+qzgTjfuZdLWwx1BT0Az6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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