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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec34bab97892a1ef55a428ef08b4ac629acca137c7ccdc964212ef6b972ec066' 
  AND token = 'qor2hCMiu9NjP6I5g6darT1SazsFt12QygEJxJq+Dtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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