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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28196e3fd72c1f962b6c7a899fc22cd4f5579f14428fa3da38bc2d96ebd92f95' 
  AND token = 'pYFOog5tptXaHryKdDPESlmi41Ic3ucEe60s88PqcQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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