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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c2f8bc214abd295e3dcf8e466d3c16f73cc0e7ed138206549a6900ee57baaf' 
  AND token = 'wFbgOtC3uIkIbM529TIRomM7jK5Bnmwccni9QDirNd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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