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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20dabbd46a0013c3e97a221d75d0ef78f8556a1ca2865b7f8a9021f5981f3ce6' 
  AND token = 'YwoJoJEGN//ekr/F34zWlFN9ruBkfTjG68k/2x45Nc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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