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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '146b0b6673a8a4d762f65fbc6e832811625b2ea599acc50717eff6ba2db9a08b' 
  AND token = 'i1xS7mov5t6PAGlM4Ta/QT+6FCffKLd0DuUiDkhiaLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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