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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd9f9715c4649b39c2d65fee4f9a44ef0a7f5bb63c0612f23587da825500f7f' 
  AND token = '7wSkaZ1Ap8Q2WBhoP0ngl2/Ks3ZOAXH5HOKcJ/fbXB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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