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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c034506b18410f585647bb289ab6770455b14afa5c85dbabe9ae4392876ec0' 
  AND token = '4J4LyBgnuCEYEWfl8VPPb0tImhuQCgxkx3/b4IrWAcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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