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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbf850379ba85bcbd80cd65c2f4add20de70137dae261e0da1c05067f649f75' 
  AND token = 'CkxKRy8uFYcO9bzuIuD9i0BLRo6pFHyy21Valofr/J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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