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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6432af3d6c736d0c3ee9e5b2eed04f8102023c8dc4b92784087cf053eca4f274' 
  AND token = 'J3kbihgH1FfZFaUr0d1aVdPTaaAMmQpSc73/fafe96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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