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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56dbabd101b5e0f978c1188de223648ffc4094d1991fcc2f18282c926c018cc6' 
  AND token = 'S+k123rzyW4knOui8PlZU8yelikuzKH7JRP1SUaVjzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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