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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4339d339084339e4b7c2f90fb183abfa2aec4b596a473afe76ad8e673759c7ad' 
  AND token = 'H+HMdS/2yOO1ah+IfJ0hwExL93SROVHRsRCj4dvtVv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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