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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe027fc322107a725839a46e136c585082d8cf3390095e6ef343b027b29f98bd' 
  AND token = 'LFFCuq2+Bsoiy951hZE731H7tJwtdCSIsI4kNEzooX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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