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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5292c5d18ed3c055ffc09373e0d337d107121b1dbd907c21d5306b70514185' 
  AND token = 'fNTmCnRfFg3zag+iJDba2qjqacRM+s0NX24onZKgS0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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